<template>
  <div>
    <!--     <h2>这是父组件{{ num }}</h2>
    <Son :value="num" @addNum="num++" /> -->
    <!-- <Son v-model="num" /> -->
    <!--     <Son
      :aa="num"
      :bb="num2"
      @update:aa="val=>num=val"
      @update:bb="val=>num2=val"
    /> -->
    <!-- 语法糖的写法:***.sync -->
    <Son
      :aa.sync="num"
      :bb.sync="num2"
    />
  </div>

</template>

<script>
import Son from './Son.vue'
export default {
  components: { Son },
  data() {
    return {
      num: 100,
      num2: 200
    }
  }

}
</script>

<style>

</style>
